煤炭型城市城区河流水质现状评价与分析——以宿州市沱河为例

Evaluation and Analysis on Water Quality of Urban River in the Coal Cities——Taking Tuohe River in Suzhou City as An Example

指出了煤炭型城市城区水污染较为严重,然而当今学者对三四线煤炭型城市城区河流的水质状况关注较少。以煤炭型城市宿州市城区河流沱河为研究对象,测定了水体中的总氮(TN)、氨氮(NH3-N)、总磷(TP)、高锰酸指数(CODMn)等指标,运用综合因子水质指标指数法进行了污染评价,同时运用营养状态指数法进行了富营养化评价。结果表明:沱河中TN浓度整体处于Ⅴ类水,NH3-N、TP、CODMn平均浓度水评处于Ⅱ类、Ⅳ类、Ⅲ类水;综合因子水质指标指数法显示沱河水质总体良好,符合《安徽省水环境功能区划》中的Ⅳ类水目标水质,但临近宿州火车站T21、T22点位综合因子水质指标指数分别为5.211、5.121,未达到Ⅳ类水质目标,呈轻度污染状态,需要引起有关部门重视。

The water of coal cities is seriously polluted,but scholars pay less attention to the water quality of urban rivers in the third/fourth line coal city.Taking Tuohe River in Suzhou city(a coal city)as the research object,this paper determines the contents of total nitrogen(TN),ammonia(NH3-N),total phosphorus(TP),permanganate index(CODMn),and other pollution indicators in the water.Based on these pollution indicators,the pollution level was assessed by using the single factor water quality index method and the comprehensive factor water quality index method,and the eutrophication level was evaluated by using the eutrophication evaluation method.The results showed that the TN contents in the Tuohe River belong to class V water level.Meanwhile,the contents of NH3-N,TP and CODMn reach class II,class IV,and class III water level,respectively,which meet the target water quality of class IV water in water function regionalization of Anhui Province.However,the comprehensive factor water quality indexes of sites T21and T22near Suzhou Railway Station are 5.211and 5.121,which don’t meet the classⅤwater level and belong to a slightly-polluted level.The relevant government departments need to usually monitor the pollution of sites T21and T22.